Posted by Anonymous on Monday, February 18, 2013 at 10:52am.
You have 800 feet of fencing to enclose a rectangular plot that borders on a river. If you do not fence the side along the river,find the length and width of the plot that will maximize the area. What is the largest area that can be enclosed?

College Algebra  JJ, Monday, February 18, 2013 at 11:35am
I know how to do this with calculus, but algebraically it starts the same way.
L + 2W = 800 L = 800  2w
A = LW
A= (8002w)w
A = 800w  2w^2
Take the derivative: 800 4w
800 4w = 0 to find max.
800 = 4w
200 =w
l = 400 
College Algebra  Anonymous please help :), Monday, February 18, 2013 at 11:43am
Thank you!

College Algebra  Yan, Thursday, August 14, 2014 at 10:17am
How did it become 8004w from 24002w^2?